I am new in Multiplayer Game Development, I have already developed a offline game and now I want to make it a multiplayer, so with help of my friend we create a server side script in node.js, but I don't know how to integrate this in my c++ project,
I've googled but, can't find anything helpful.
anybody can suggest any tutorial.
Thanks
You've asked a big open-ended question. As Allern suggests there are a lot of things that you can do with networked programs that can extend it well beyond that of a single user game. For instance in my current game there is an access to a version welcome page in html. There are file downloads for campaign/user maps and there are connections to Firebase for leaderboards and other networked resources like ads.
However, I suspect you are referring to the communications between a number of separate user machines all synchronized to keep them coordinated. For this you will need to write some serialization code to transmit to and receive packets from the central server. Typically a serialization package like flatbuffers will be needed to move information from your data structures to a packet and the reverse.
You might also require communication/network software to asynchronously send and receive those packets (this may be included in whatever game engine you might be using). Boost.asio might help otherwise. There are numerous other networking packages and libraries all the way down to the bare-bones unix/POSIX calls (or Windows OS calls).
You will also need software on the server side to log users in, deal with players disconnecting and doing the main work of passing the game packets around. This software may also implement the logic of your game (game rules) and might do saves on the data if you want users to be able to play the game in multiple sessions (like a big dungeon crawl). There might be packages out there that do most of the server side stuff. If so, please post what you find out.
Cocos2dx does have some networking software built in but it isn't very functional as far as I'm concerned. It does have facilities to display web pages and download files fairly easy but the async communication seems a little weak. You can try the Network module in the API Docs which may have what you are looking for.
Since the type of game and how you want to implement your player interaction will dictate how the software is to be built I'm afraid this answer is a little vague. Good luck. Share your insights.
you can use public tools , as a sample is websocket,it can support C++ and javasc
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I'm implementing a game app based on cocos2d-x. In order to technically prevent cheating, one of the ideas to do is using HTTPS for all the client-server communication, which make it difficult to get the data format / game logic and send modified request to cheat. (I know "prevent" is actually impossible but for increasing the cost of making game cheating it's ok : ). My question is,
In Cocos2d-x, how to make HTTPS request? Possible?
In a more general case, technically what to do to reduce such game hacking? What strategy to hold?
For native cross platform C++ networking you may consider using Boost C++ libraries. Boost.Asio is the one used for networking.
Boost.Asio link:
http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio.html
Boost.Asio tutorials link: http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/tutorial.html
Although not officially supported (only due to lack of regression testing on iOS and Android), Boost runs without any problems on iOS and Android (and probably other C++ based mobile platforms as well).
To prevent cheating you usually rely on an external source (which can be your game server) e.g. if your game relies on the time of day you may get the time form an external server. You may use encryption libraries for data transfer on the client and server side.
by using curl library you can make https connection.
if you want technically protect your game use you own strong encryption technique.
Thanks
Hi this is a problem we face all the time. If the cheating is limited to the cheater's instance the questions is academical and should be studied on your spare time.
On the other hand when your income is impacted or when the cheater's actions impact other players and degrade the game experience you should put some effort on testing the game state for inconsistencies, secure the client/server transactions and deal with cheating in very subtle ways to avoid completely deterring the cheaters' interest.
C++ https implementations are available with curl and boost.
Concerning the game data, the simplest way to test for inconsistencies are scores. You can add a few indicators to avoid polluting your leaderboards. You can add special checksums based on the score's components (time spent in game, number of power ups and score multipliers received...) if you can recalculate the score on the server and if inconsistencies are discovered you can deal with it.
Also you can grab instants of the game state and a few commands, encode that and replay the sequences on the server to check for inconsistencies. Deal with cheaters however you like.
When playing on a server let the server manage the gamestate and allow no client side game state changes that would impact players. Check for input consistency etc...
When using micro transactions each micro transaction should be verified with the vendors servers before being fully committed to the player's account.
Even if these papers 1, 2 from valve refer to fps games they should give you some pointers as to how to deal with state inconsistencies (introduced by communication delays). It should help in avoiding fake positives and ruining the experience for non cheaters.
I am looking to create a simple mobile agent system which will deal with 4 tasks, i.e 4 different mobile agents jobs: Database update, meeting scheduling, network services discovery and kernel update.
I have done my research and have seen different frameworks such as Aglet, Jade, agent builder etc. My question is which one should i use? Also i need to setup the base code for it to work, can someone point me to a site or help me to setup the basic functions of the mobile agent?
I've read about tahiti server for the Aglet model. I'm quite confused about how to set up the mobile agent system. Any help would be much appreciated.
I have also tried to it using RMI. I had created a method of type agent, but i couldn't pass it through remote method implementation. I was reading about tcp and udp socket programming. I was thinking may be it would be more fair to do it using socket programming. In this case, would this be called an agent? I was thinking about the server sending datagram packets to multiple clients.
You need to ask yourself why you want to use mobile agents at all. The notion of a mobile agent was popular in the agent research community in the early 90's, but fell out of favour because (i) it wasn't clear what problem it was solving, (ii) the capability to allow arbitrary code to migrate to a particular computer and execute with enough privileges to access local data and services is very open to abuse, and (iii) all of the claimed benefits of mobile agents can actually be achieved though web services (REST or otherwise) and open data formats such as RDF. Consequently, few, if any, mobile agent platforms have been properly maintained since the early experiments.
It also sounds as though you need to be clear which end-user problem you want to solve. Scheduling a meeting and updating my kernel are very different tasks - I'd be very uncomfortable with a program that claims do both. If your interest is in the automation of system maintenance tasks, such as DB tuning and kernel patching, on large networks you might want to look at the SmartFrog project, or read up on autonomic computing.
I use JADE and I agree with the first guy, agent systems usually take alot of overhead to going so if you can avoid it, please do. If however you choose to proceed choose a platform with alot of support and a big user group.
Jade has some neat features like a directory facilitator DF, which works like a yellow pages so other agents don't have to know what agents are running and what services are supplied they can simply inquire by the DF.
Also JADE ContractNetBehaviours help simplify communication.
I will soon be developing an application to log and priorities worker shifts. It only needs to be small, and simple, but I am wondering what framework to use. All that needs to happen is boxes with names are in 3 lists, and the user can switch these around at will. It must log the times, which I will need access to in real time.
Im new to application development of this sort, and would like any suggestions. I have time to learn new technologies / languages.
Portability / device independence would also be useful. Should I consider a Web Application in Javascript? or something more like Python.
Thanks.
Even if your application is going to be simple that does not mean that whole system will be simple too. I can imagine that your app will serve only as a front end to something much bigger. If that is a case and you really have freedom to choose what language you will develop your app with consider choosing something that you will feel comfortable to work with. But before you will make your decision I would go to whoever gave you that task and try to get as much information about it as you can because expected features can help in choosing technology.
First of all, it seems that it is up to you to decide if it should be web or desktop app. In my opinion it is completely wrong situation. You should get clear requirements on what kind of application customer expects and in what environment it should work. And I would not move a finger towards a code before somebody gave me that information. You write that portability and device independence would be useful but is it actual requirement or you just think it would be nice feature to deliver?
EDITED (to answer a question in comment)
Probably there is as much possible solutions as people that would answer you so in the end you will have to make your own choices.
One way of doing it (considering that you want to learn something new and have a challenge :) would be implement WCF service that would act as a data provider from your database (so every GetUsers(), GetVacationDays() methods would be in it) and it would take care of some business logic (for example CalculateMaxValidWorkingTime() or whatever). That service would be a real power horse of your system. Since you don't have clear requirement whether it should be desktop or web app you could satisfy both possibilities by creating thin clients that would communicate with your service and they would be just a pretty front ends. And if you keep in mind that you can consume webservices practically with everything from C++ to .NET (C#/VB) to Javascript to Python to PHP after you done with service you would not be constrained with one particular technology/language.
Regarding databases I won't advice because personally I hate dealing with them and it always was somebody else's task to provide me with pretty API :)
I'm sure many of you are familiar with the IBM i5 series emulator (looks like this poop)
My company uses this religiously and there is no Biz logic in it so anytime somone in our finance dpt makes a human error it accepts it and adds it to the database. Not to mention its ugly, hard to use, not intuitive, etc....
I would like to create a frontend for this interface so that we can control the logic before its submitted to the system (we dont control the system itself) so in effect I need to make my own emulator app.
However I cant seem to find any information on how to interface with the i series, namely login, send commands, and view or gather data from the screens it would normally send back.
Any suggestions?
The problem is not the iSeries but the software package your company is running on it.
There ARE advantages to use green screens: it's fast and it's almost unbeatable at data entry, provided you get used to it.
But to answer your question, the iSeries is a J2EE enabled machine: a HTTP server comes installed and depending of the version of the iSeries, WebSphere might be already installed, or are entitled to install it. Then you can use JT400, which is the java toolkit for the os400 containing the jdbc drivers to connect the database and the necessary classes for calling programs.
If you prefer php, there is a flavor of the Zend framework made to work on the iSeries but I never tried it.
I'd recommend that you take a look at both the Attachmate Verastream Host Integrator (VHI) and IBM's Host Access Transformation Services (HATS) products. They effectively just screen scrape the green screen terminals to allow you to pull and push data and provide macro recording and editing tools to automate the process. App integration can be achieved via web services or html/jsp/servlet programming (plus .Net for VHI and EJB's for HATS). They do come with enterprise pricing however which may be an obstacle for some. They do have free trial offerings for evaluation purposes to help determine if they are an appropriate solution to your problem.
What software packages are they using? Most programs that I use in the 5250 emulator has some business logic that error checks the data before adding it to the database. Can you get us some more information so we can direct you in a better direction.
There are vendors that sell products that screen-scrape the 5250 data stream and produces a web front-end. Or you can write your own front-end in the language of your choice and just do SQL calls to the database.
THere's got to be some source code. Start by looking at the menu and menu option your users are accessing and figure that's running behind them.
Use command STRPDM to look for source code - look in different libraries (they are like folders)
You might have source code in a "member" called something like xxxMNUSRC xxxRPGSRC (rpg program source) or xxxCLSRC (cl programs), xxxDDSSRC (display/screen source, physical/logical file source)
Objects a "compiled" objects such as files (tables), screens, priter files (reports)
Stay away from Qxxx and #xxx libraries - those are system libraries.
http://systeminetwork.com/ is a good resource for iSeries related questions.
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This is a very newbie question.
I want to know how to create a web app to make a telephone call, most likely using VOIP protocol.
What programming languages, both client and server side, do I have to learn?
The primary question you need to answer to get started is are you looking for a computer to computer call or do you want your app to call a telephone number?
Since you specify that you want your "web app to make a call," I suspect you're looking for a way to place automated calls to a user's telephone. If that's the case, you've got a few options.
Install a VoIP server like Asterisk or Freeswitch and write code to have your web app interact with it. For Asterisk, the Adhearsion project can help by allowing you to write Asterisk integrations in Ruby. http://adhearsion.com/
Or you can use a cloud telephony service like Cloudvox or Tropo http://tropo.com (disclosure, I work for Voxeo, the company behind Tropo). These services allow you to use web programming languages and web services to talk to the phone system. You don't need to know anything about Voip to make it happen. A sample Tropo script...
<?php
answer();
say('Yes, it really is this easy.');
hangup();
?>
A side benefit to the cloud services is many of them allow your app to run over other communications channels (Tropo does IM and SMS, too).
The third option is to look into VoiceXML, a W3C standard for creating voice apps. Voxeo provides detailed docs and VoiceXML tutorials at http://vxml.org/. With a VoiceXML (sometimes called VXML) application, you can install a VoiceXML server and the associated VoIP bits or you can use a VoiceXML hosting provider. Voxeo provides both a downloadable server and hosting (both are free for developers), or a search for VoiceXML hosting will reveal a large number of options.
The answer to your question really depends on what you want to do with it. Here are 2 examples of how I have gone about it:
I developed the software for Go2Call.Com (now owned by Deltathree), and it was used for PC-to-Phone calling. In Go2Call's case, it was a Java applet for the dialer frontend that called a Windows DLL written in C++. From there, it spoke a proprietary protocol to talk to the servers which in turn sent the call to regular landlines.
A few years later, I wrote a web-based (ActiveX control) that would allow PC-to-PC or PC-to-Phone calling, and it used the standard H.323 protocol.
I would recommend starting out by figuring out what your end goal is and then looking up the necessary protocols and technologies to accomplish it.
For PC-to-PC, you can do whatever you want if both people use your software. In that case, you can figure out how VOIP works (including compression codecs, etc.) and implement it however you want.
For PC-to-Phone or when you want to call someone else's software, I'd recommend SIP since it's probably the most popular protocol. H.323 is still prevalent, but SIP seems to be taking over.
Sorry this doesn't probably tell you everything, but there's a lot to it. Hopefully, this will get you started in the right direction.
Update: Since you mentioned PC-to-PC, Packetizer has a list of standards and quite a bit of info I used way back when I did a lot of VoIP programming.
As far as books go, the books I've seen so far aren't programming-related but more about using VoIP software and installing VoIP networks.
Gizmo5 has a Flash softphone that runs in the browser: GizmoCall
On the server side, you'd probably link it up with an SIP solution in any language. Asterisk comes to mind, although it may be a bit overkill depending on whether you really wanted a full-blown SIP solution or not.
You may wish to purchase a component which allows you to add SIP functionality to your webpage, (most of these ones are ActiveX based):
http://www.conaito.com/
http://www.vaxvoip.com/
http://www.pcbest.net/
As for the language you have to learn, well what languages have you learned already? Which languages have you developed web apps with? This determines your choice of language. Using components like those listed above take some of the legwork out, but still will require probably vbscript or javascript coding client side, and those that are activeX will only work on Internet Explorer webbrowsers.
If you have no experience then you need to look seriously at what you are trying to do, why, how much time and effort you can and are willing to put in.